A simple machine used to raise a flag is a
2 answers:
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Condition for diffraction
Where
a = Distance between slits
m = Order of the fringes
= Wavelength
= At the angle between the ray of light and the projected distance perpendicular between the two objects
For small angles
Where
Where L is the distance between the slits and Y the length of the light.
Replacing we have
The distance between slits d can be expressed also as Where N is the number of the fringes, then
Similarly when there is added a new Fringe we have the change of the distance would be :
Linear distance between fringes is
Therefore the answer is